| ZnO | LiNbO3 | AlN |
Aluminum | 173.5 Hz, 2.80 mW | 187.5 Hz, 0.12 mW | 279.5 Hz, 0.61 mW |
Steel | 170.0 Hz, 4.02 mW | 183.5 Hz, 0.10 mW | 272.0 Hz, 0.92 mW |
Silicon | 175.0 Hz, 1.12 mW | 189.0 Hz, 0.04 mW | 281.0 Hz, 0.81 mW |